Director Terry Gilliam wants his Johnny Depp to film the remaining scenes.

A studio source said: “There is a point in the film when Heath falls through a magic mirror. He could change into another character after that and that is where Johnny would come in.

“It’s a weird, fantasy, time-travel movie so Heath’s character could easily change appearance. It would be a poignant moment.

“Johnny’s not working at the moment so everyone is praying he will do it.”